Merge "Add extra key to StreamingCall." into udc-dev am: 6bbc974a am: 36881780 am: 652606b0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22912877



Change-Id: I61043b0bfb1aa5eea1a17c3382d95e2f66d125d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>